#define _CRT_SECURE_NO_WARNINGS 1
#include<iostream>
#include<vector>
using namespace std;
class Solution {
public:
    string longestCommonPrefix(vector<string>& strs) {
        for (int i = 0; i < strs[0].size(); i++)
        {
            for (int j = 1; j < strs.size(); j++)
            {
                if (strs[j][i] != strs[0][i] || i >= strs[j].size())
                {
                    return strs[0].substr(0, i);
                }
            }

        }
        return strs[0];
    }
};